Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A user terminal comprising: a transmitter that transmits a discovery signal for Device to Device (D2D) communication in a transmission duration of a predetermined period; a receiver that receives cyclic prefix (CP) length configuration information which represents a CP length for use in transmission of the discovery signal; and a processor that determines both of the transmission duration and transmission power based on the CP length configuration information, wherein the transmitter transmits the discovery signal in the determined transmission duration with the determined transmission power.
This invention relates to wireless communication systems, specifically improving Device-to-Device (D2D) communication by optimizing discovery signal transmission. The problem addressed is the need for efficient resource utilization and reliable signal detection in D2D networks, where devices must discover each other without excessive power consumption or interference. The invention describes a user terminal designed for D2D communication. The terminal includes a transmitter that sends a discovery signal periodically over a transmission duration of a fixed period. A receiver obtains cyclic prefix (CP) length configuration information, which specifies the CP length to be used for transmitting the discovery signal. A processor then determines both the transmission duration and transmission power based on this CP length configuration. The transmitter subsequently sends the discovery signal using the calculated duration and power. By dynamically adjusting transmission parameters based on CP length, the system ensures better synchronization and reduces interference, improving discovery signal reliability. The solution optimizes power usage and spectral efficiency while maintaining robust D2D communication. This approach is particularly useful in dense networks where efficient resource allocation is critical.
2. The user terminal according to claim 1 , wherein the CP length is a first CP and/or a second CP that is longer than the first CP.
A user terminal for wireless communication systems is disclosed, addressing the need for improved signal processing in environments with multipath interference or timing misalignment. The terminal includes a receiver configured to process signals with cyclic prefix (CP) lengths, where the CP length can be dynamically adjusted between a first CP and a second CP, with the second CP being longer than the first. The longer CP helps mitigate inter-symbol interference (ISI) and inter-carrier interference (ICI) caused by multipath propagation or timing errors, particularly in high-mobility or high-delay spread scenarios. The terminal may also include a transmitter configured to transmit signals with the selected CP length, ensuring synchronization between the terminal and the network. The system may further include a controller to determine the appropriate CP length based on channel conditions, such as delay spread or mobility, to optimize performance. This adaptive CP length adjustment enhances reliability and efficiency in wireless communications, especially in challenging propagation environments.
3. The user terminal according to claim 1 , wherein the receiver receives information indicating the transmission duration, and the transmission duration is configured based on the received information.
A user terminal is configured to receive information indicating a transmission duration for data communication, where the transmission duration is dynamically adjusted based on the received information. The terminal includes a receiver that obtains this transmission duration data, which may be used to optimize communication efficiency, reduce latency, or manage power consumption. The transmission duration can be configured to adapt to varying network conditions, application requirements, or user preferences, ensuring flexible and efficient data transmission. This adaptive configuration allows the terminal to dynamically adjust the duration of data transmission sessions, improving overall system performance and resource utilization. The terminal may further include a transmitter for sending data and a processor for managing communication parameters, ensuring seamless integration of the transmission duration adjustments into the overall communication process. By dynamically configuring the transmission duration, the terminal can enhance reliability, reduce interference, and improve the user experience in diverse communication environments.
4. The user terminal according to claim 3 , wherein the information indicating the transmission duration includes at least one of a subframe offset and the period of the transmission duration.
A user terminal in a wireless communication system is configured to receive and transmit data with precise timing control. The terminal includes a receiver to obtain scheduling information from a network node, where the scheduling information specifies a transmission duration for uplink data. The transmission duration is defined by at least one of a subframe offset and a period, allowing the terminal to synchronize its transmissions with the network's timing framework. The terminal also includes a transmitter to send the uplink data within the specified transmission duration, ensuring efficient resource utilization and minimizing interference. The scheduling information may further include additional parameters such as resource allocation details or modulation schemes to optimize data transmission. This design enables reliable and synchronized communication in dynamic wireless environments, addressing challenges related to timing misalignment and resource contention in high-density networks. The terminal's ability to interpret and apply the transmission duration parameters ensures compatibility with various network configurations and enhances overall system performance.
5. The user terminal according to claim 2 , wherein the receiver receives information indicating the transmission duration, and the transmission duration is configured based on the received information.
A user terminal in a wireless communication system is configured to receive information indicating a transmission duration for data communication. The transmission duration is dynamically adjusted based on the received information, allowing the terminal to optimize its communication parameters. This adjustment may involve modifying the length of time allocated for transmitting or receiving data, which can improve efficiency, reduce latency, or adapt to varying network conditions. The terminal may also include a transmitter for sending data and a controller for managing communication operations, ensuring that the transmission duration is properly configured in response to the received information. This adaptability helps the terminal maintain reliable and efficient communication in different scenarios, such as varying channel conditions or network load. The system may be part of a broader wireless network where multiple terminals and base stations interact, and the transmission duration settings may be coordinated across the network to enhance overall performance.
6. A radio base station used in a radio communication system in which a discovery signal for Device to Device (D2D) communication is transmitted and/or received between user terminals in a transmission duration of a predetermined period, the radio base station comprising: a processor that determines a cyclic prefix (CP) length for use in transmission of the discovery signal; and a transmitter that transmits CP length configuration information that represents the CP length, wherein the user terminals determine both of the transmission duration and transmission power based on the CP length configuration information, and wherein the user terminals transmit the discovery signal in the determined transmission duration with the determined transmission power.
This invention relates to radio base stations in Device to Device (D2D) communication systems, where user terminals transmit and receive discovery signals within a predefined transmission duration. The problem addressed is optimizing the transmission of discovery signals by dynamically adjusting the cyclic prefix (CP) length, which affects signal integrity and transmission efficiency. The radio base station includes a processor that determines an appropriate CP length for discovery signal transmission and a transmitter that sends CP length configuration information to user terminals. The user terminals use this information to set both the transmission duration and transmission power for the discovery signal. By configuring the CP length, the system ensures reliable signal transmission while adapting to varying channel conditions and interference levels. This approach improves D2D communication efficiency by allowing flexible adjustments to transmission parameters based on real-time conditions. The invention enhances signal quality and reduces resource waste by dynamically aligning transmission settings with the CP length, ensuring optimal performance in D2D communication scenarios.
7. The radio base station according to claim 6 , wherein the CP length is a first CP and/or a second CP that is longer than the first CP.
A radio base station is configured to communicate with user equipment (UE) in a wireless communication system, particularly in scenarios where the UE is moving at high speeds or experiencing challenging propagation conditions. The base station includes a control unit that adjusts the cyclic prefix (CP) length of transmitted signals to mitigate interference and improve signal integrity. The CP length can be dynamically set to a first CP duration or a second CP duration, where the second CP is longer than the first. This adjustment helps compensate for multipath delays and Doppler shifts, ensuring reliable communication. The base station may also include a transmission unit that sends signals with the selected CP length and a reception unit that processes received signals accordingly. The control unit may further determine the appropriate CP length based on channel conditions, UE mobility, or other factors to optimize performance. This approach enhances signal robustness in high-mobility or interference-prone environments, improving overall communication quality.
8. The radio base station according to claim 6 , wherein the transmitter transmits information indicating the transmission duration.
A radio base station is configured to manage communication resources in a wireless network, particularly in scenarios where multiple devices share the same frequency band. The base station includes a transmitter that sends control signals to user devices to allocate time slots for data transmission, ensuring efficient use of the shared spectrum. The transmitter also broadcasts information indicating the duration for which each allocated time slot is valid, allowing user devices to synchronize their transmissions and avoid collisions. This duration information helps devices determine when they can transmit data without interfering with other transmissions, improving overall network efficiency and reducing wasted bandwidth. The base station may also include a receiver to monitor the network and adjust transmission parameters dynamically based on real-time conditions, such as signal strength or interference levels. By providing clear duration indicators, the system ensures reliable communication while minimizing conflicts in the shared frequency band. This approach is particularly useful in dense wireless environments where multiple devices compete for limited resources.
9. The radio base station according to claim 8 , wherein the information indicating the transmission duration includes at least one of a subframe offset and the period of the transmission duration.
A radio base station is configured to manage communication resources in a wireless network, particularly for handling transmission durations in a flexible and efficient manner. The base station includes a control unit that determines and communicates information about the transmission duration for data transmission to a user device. This information includes at least one of a subframe offset and the period of the transmission duration. The subframe offset specifies the starting point of the transmission duration relative to a reference time, while the period defines the recurring interval at which the transmission duration repeats. By providing this information, the base station enables precise scheduling and coordination of data transmissions, reducing interference and improving resource utilization. The control unit may also adjust the transmission duration dynamically based on network conditions, ensuring optimal performance. This approach enhances the efficiency of wireless communication by allowing flexible and adaptive scheduling of transmissions, particularly in scenarios where dynamic resource allocation is required. The base station may further include a transmitter for sending the transmission duration information to the user device, ensuring synchronized and reliable communication.
10. The radio base station according to claim 7 , wherein the transmitter transmits information indicating the transmission duration.
A radio base station is configured to manage communication resources in a wireless network, particularly in scenarios where multiple devices share the same frequency resources. The base station includes a transmitter that sends information to user devices about the duration for which a transmission will occupy a shared frequency resource. This allows devices to coordinate their use of the resource, avoiding collisions and improving efficiency. The base station may also determine the transmission duration based on factors such as data size, network conditions, or device capabilities. By providing this duration information, the base station enables devices to schedule their transmissions more effectively, reducing interference and optimizing resource utilization. This is particularly useful in dense wireless networks where multiple devices compete for limited frequency resources. The transmitter may use control signaling or dedicated channels to convey the duration information, ensuring that devices receive timely updates to adjust their transmission schedules accordingly. The system enhances overall network performance by minimizing conflicts and maximizing the efficient use of available spectrum.
11. A radio communication method comprising: in a user terminal, transmitting a discovery signal for Device to Device (D2D) communication in a transmission duration of a predetermined period; in the user terminal, receiving cyclic prefix (CP) length configuration information which represents a CP length for use in transmission of the discovery signal; and in the user terminal, determining both of the transmission duration and transmission power based on the CP length configuration information, wherein the user terminal transmits the discovery signal in the determined transmission duration with the determined transmission power.
This invention relates to radio communication methods for Device to Device (D2D) communication, specifically addressing the transmission of discovery signals. The problem solved involves optimizing the transmission duration and power of discovery signals based on cyclic prefix (CP) length configuration information. In D2D communication, devices must efficiently discover nearby peers while minimizing interference and resource usage. The invention provides a method where a user terminal transmits a discovery signal within a predefined transmission duration. The terminal receives CP length configuration information, which specifies the CP length for the discovery signal transmission. Based on this information, the terminal determines both the transmission duration and transmission power. The discovery signal is then transmitted using the determined duration and power. This approach ensures that the discovery signal is transmitted with appropriate parameters, balancing signal integrity and resource efficiency. The CP length configuration influences the transmission settings, allowing adaptability to different communication environments. The method enhances D2D communication by dynamically adjusting transmission parameters to improve reliability and reduce interference.
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August 20, 2019
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